Xanthenyl semicarbazides as gastric antisecretory agents

ABSTRACT

1. A THERAPEUTIC COMPOSITION WHICH COMPRISES AN ANTISECRETORY EFFECTIVE AMOUNT OF AN ACTIVE INGREDIENT SELECTED FROM THE GROUP CONSISTING OF (A) A COMPOUND OF FORMULA I   XN-N(-R1)-CO-N(-R2)-N(-R3)-R4   WHEREIN XN REPRESENTS THE GROUP   XANTHEN-9-YL- WHEREIN THE BENZO RINGS ARE LABELLED   A AND B   IN WHICH THE RINGS A AND B OPTIONALLY CONTAIN SUBSTITUENTS SELECTED FROM THE GROUP CONSISTING OF HALOGEN, LOWER ALKYL, LOWER ALKOXY AND HYDROXY; R1 IS HYDROGEN LOWER ALKYL OF LOWER ALKENYL; R2 IS HYDROGEN OR LOWER ALKYL; R3 IS HYDROGEN OR LOWER ALKYL; R4 IS HYDROGEN OR LOWER ALKYL; (B) A PHARMACEUTICALLY ACCEPTABLE ACID ADDITION SALT OF A COMPOUND OF FORMULA I; AND (C) WHEN R3 AND R4 ARE EACH LOWER ALKYL, A PHARMACEUTICALLY ACCEPTABLE QUATERNARY SALT OF A COMPOUND OF FORMULA I; AND A PHARMACEUTICALLY ACCEPTABLE EXCIPIENT, SAID COMPOSITION BEING SUITABLE FOR ORAL, RECTAL OR PARENTERAL ADMINISTRATION.

United States Patent M Int. Cl. A61k 27/00 US. Cl. 424-283 13 Claims ABSTRACT OF THE DISCLOSURE 4-(9-Xanthenyl)semicarbazide and thiosemicarbazide, 4-(9-thiaxanthenyl)semicarbazide and thiosemicarbazide, and derivatives of these compounds, useful as antisecretory agents, pharmaceutical compositions thereof and method of treating therewith.

This application is a division of our copending application Ser. No. 858183, filed th September 1969, now US. Pat. No. 3,686,218, which in turn is a continuationi'n-part of our application Ser. No. 662,987, filed Aug. 23, 1967, now US. Pat. No. 3,644,420, the entire disclosure of which is incorporated herein by reference. The subject matter of this application was subjected to a requirement for restriction in application Ser. No. 858183, Paper No. 4.

This invention relates to new derivatives of xanthen and thiaxanthen which have valuable biological activity. According to one feature of the invention there are provided compounds of formula I lit X1 2 xnN-( N-NR,R. I wherein Xn represents the group in which -X and X are oxygen or sulphur;

for

R and R taken together represent (CH where m is 3 or 4, and one of the --CH groups may be replaced by CO;

, R and R together with the nitrogen atom to which they 3,842,178 Patented Oct. 15, 1974 are attached form a saturated 57 membered heterocyclic ring, optionally containing an additional hetero group selected from NH, O, S or. N-lower alkyl;

together with pharmaceutically acceptable acid addition Salts of compounds of formula I;

and

when R and R each represent alkyl, substituted alkyl, or alkenyl, or together form a ring as hereinbefore defined, pharmaceutically acceptable quaternary salts of compounds of formula I.

The term substituted alkyl includes alkyl radicals containing substitutents such as hydroiiy, halogen, amino, alkanoylamino, alkoxycarbonylamino, alkylamino, alkanoyl-(alkyl)amino, alkoxycarbonyl(alkyl) amino, dialkylamino, aryl, aryloxy, alkoxy, acyloxy, and carboxy (in free acid, salt or ester form).

Alkanoyl and alkoxycarbonyl preferable indicate such groups containing up to 8 carbon atoms.

Acyl indicates the acyl residue of a carboxylic acid; such acids include aliphatic carboxylic acids, preferably C aromatic carboxylic acids, heterocyclic carboxylic acids, carbonic acids, N-alkylcarbami'c acids, N,N-dialkylcarbamic acids, N-phenylcarbamic acid, N,N-tetramethylene carbamic acid, N,N-pentamethylenecarbamic acid, N,N-3-oxapentamethylenecarbamic acid and N,N-3-thiapentamethylenecarbamic acid.

Alkyl whenever used above preferably indicates lower alkyl, containing up to 7 carbon atoms.

Acids which may be used in the quaternary salts defined above may be any conventional quaternisation acids which lead to pharmaceutically acceptable salts, for example HX (where X is halogen) and toluenesulphonic acids.

The methods that can be used to prepare the compounds of formula I depend to some extent upon the nature of R by way of example the following typical methods are shown:

(a) by reaction of a xanthydrol or thiaxanthydrol of formula XnOH (or an ester thereof) with a compound of wherein X is halogen, with a hydrazine of formula IV. Obvious chemical equivalents (inthis tyye of reaction) of compounds of formula VI may also be used, such as compounds of formula VI wherein X is N NCX; or -X acyl;

(e) by reaction of a compound of formula VII Xn-Y VII with a compound of formula VIII R1 X1 Br I H I Z-N N-NR:R4 VIII in which one of Y and Z is a halogen atom and the other is one equivalent of a metal, preferably sodium, potassium or lithium;

(f) by reaction of an ester of a compound of formula IX XnNC-X1H V a X with a hydrazine of formula IV; preferred esters include those of formulae X and XI i i Xn-NC-- S Phenyl X 1]: (H) Xn-NCON (lower alkyl); 'XI

(g) by reaction of a compound of formula XII v XnNHR j I XII with a carbazoylating or thiocarbazoylating agent capable of providing the it C-NRzNR Ih I group; examples of such agents, which are chemical equivalents in this type of reaction, are the following:

7, (1) an ester of a compound of formula XIII RsR4N-N-C-X1H XIII; a preferred ester is R R N=N(R )C(O)S-Phenyl; (2) a compound of formula XIV Xi R2 it I x- N-NRsRA XIV wherein X is halogen or an obvious chemical equivalent (in this type of reaction) such as N NCX or -X -acyl; (3) a compound of formula XV X1 Rz RiNHC-N-NR3R4 XV and (4) a compound of formula XVI 1I i |fiIl 2 NO2N( JNNRaR4 XVI;

(h) by reduction of a compound of formula XVII IfiI-C-N-NRsR;

x/ v v I xvrr,

by conventional means, for example by hydrogenation in the presence of standard catalysts such as platinum, palladium, and the like, to give a compound of formula I wherein R is hydrogen;

(i) by reduction of a compound of formula XVIII in which R is alkylidene, cycloalkylidene or alphaalkoxyalkylidene 'to' give I a compound of formula I wherein one or both of R and R are hydrogen; reduction is-carried out by conventional means, for example by hydrogenation in the presence of standard catalysts such as platinum, palladium, and the like; or by the use of sodium in a lower alkanol;

(j) by reductive alkylation of a compound of formula XIX in which R is lower alkyl and X is halogen.

4 "by conventional means, for example using 'an' aldehyde or ketone of formula R COR (wherein R is alkyl and R is hydrogen or alkyl) and hydrogen in the presence of a standard catalyst such as platinum, palladium, and the like, togive compounds of formula I wherein R s hydrogen and R is alkyl; (k) bytalkylation, alkanoylation or alkoxycarbonylatiqn by conventional means of a compound of formula I in r; which at least one of R is a hydrogen-atom tofgive the corresponding N-alkyl, N-al kanoyl or N alkoxycarbonyl compound; a or; (1) by N-alkanoylation, N-alkoxycarbonylation or O-acylation by conventional means of a compound of formula I containing an NHor OH group to give the corresponding N-a'lkaii'oyl, N-alkoxycar: bonyl or O-acyl compound; j (m) by dealkanoylation, dealkoxycarbonylationor, deacylation of a compoundof formula I containing an N- alkanoyl, N-alkoxycarbonyl or O-acyl grouprespectively to give the corresponding N H o r OH compound; (11) by alkylation or trialkylsilylation of ,.a compound of formula I containing an OH group to give the corresponding alkoxy or trialkylsilyloxy compound; I (o) by hydrogenolysis of a compound of formula'XX 0R0 X1 R2 7 Xn-N-C-NNR3R4 I wherein R is a protecting group readily removable by hydrogenolysis; a preferred protecting group R is benzyl, but chemical equivalents (in this type of reaction) of this group will be readily apparent to the' skilled chemist; examples include methyl substituted b'y 2 or 3 phenyl groups, methyl substituted by 1, 2 or '3 p-nitr'ophenyl, p-methoxyphenyl or 4-pyridyl groups, alkylsulphonyl, arylsulphonyl, arylthio, substituted arylsulphonyl and substituted arylthio'; hydrogenation is'carried out by conventional means in the presence of stand ard catalysts such as platinum, palladium, and the like; (p) by reaction of a compound of formula I wherein R and R each represent alkyl, substituted alkyl, or alkenyl or together form a ring as hereinbefore defined with a conventional quaternising agent such as an alkyl halide, an alkyl p-toluene sulphonate, and the like, to form a pharmaceutically acceptable quaternary salt; (q) by reduction by conventional means of a compound of formula XXI 1 with a hydrazine of formula and (t) by'reaction of a compound of formula XVIII with a c mpound of formula'XXIII v We have found that compounds of formula I are antisecretory agents, with a specific activity againstgastric secretion and without any anticholinergic activity. In particular the compounds reduce or inhibit the secretionof gastric acidin animals; they are therefore useful for rere'ducing or inhibiting gastric secretion (particularly the secretion of gastric acid) and for the treatment of peptic ulceration. (The term peptic ulceration is used in its broad sense, as is conventional in the art, to include both gastric ulceration and duodenal ulceration.)

The dosage rates of compounds of formula I vary according to the values of R but normally fall within the range /3-60 mg. of compound of formula I per kilogram of body weight of subject, preferably administered daily; in the cases of the more active compounds, dosage rates of 0.5-8 mg./kg. are acceptable. The anti-secretory activity of the compounds, which has been demonstrated in the stimulated, pylorus ligated rat, has been found to be better in compounds of formula I wherein X and X are oxygen than in similar compounds wherein X and X are sulphur; substitution in rings A and B in general reduces activity.

The compounds of formula I may be administered orally, rectally or parenterally, preferably orally, the optimum dose rate varying with the activity of the compounds. A preferred dosage rate for oral administration is of the order of 25 mg.4 g. daily, preferably 35 mg.- 600 mg. daily, optionally in divided doses.

According to a further feature of the invention there are provided therapeutic compositions which comprise a compound of formula I in association with pharmaceutical excipients known for the production of compositions suitable for oral, rectal or parenteral administration. The compositions preferably contain 0.1-90% by weight of a compound of general formula I.

- Compositions for oral administration are the preferred compositions of the invention, and these are the known pharmaceutical forms for such administration, such as for example tablets, capsules, syrups and aqueous and oily suspensions.

The excipients used in the preparation of these compositions are the excipients known in the pharmacists art.

Preferred compositions are tablets wherein a compound of formula I is mixed with a conventional inert diluent such as lactose in the presence of disintegrating agent, e.g. maize starch and lubricating agents e.g. magnesium stearate. Such tablets may, if desired, be provided with enteric coatings by known methods, for example by the use of cellulose acetate phthalate. Similarly capsules, for example hard or soft gelatin capsules, containing a compound of formula I, with or without other excipients, may be prepared by conventional means and, if desired, provided with enteric coatings in known manner. The tablets and capsules may conveniently each contain 25-500 mg. of a compound of formula I. Other, but less preferred, compositions for oral administration include for example aqueous suspensions containing a compound of formula I in aqueous media in the presence of a non-toxic suspending agent e.g. sodium carboxymethylcellulose and dispersing agents, and oily suspensions containing a compound of formula I in a vegetable oil for example arachis oil.

Compositions of the invention suitable for rectal administration are the known pharmaceutical forms for such administration, such as for example suppositories with cocoa butter or polyethylene glycol bases.-

Compositions of the invention suitable for parenteral administration are the known pharmaceutical forms for such administration, for example sterile suspensions in aqueous and oily media or sterile solutions in propylene glycol.

In the compositions of the invention the compounds of formula I may if desired be associated with other compatible pharmacologically active ingredients. For example antacids and acid adsorbents such as aluminium hydroxide and magnesium trisilicate may be included in compositions for oral administraton to give an immediate antacid effect. Other pharmacologically active agents which may be associated with the compounds of formula I include compounds active on the central nervous system, including short and long acting sedatives such as the barbiturates and methaqualone, antihistaminic and/or antiemetic agents such as cyclizine and diphenhydramine, and anticholinergic agents such as atropine.

Milk and milk solids are valuable in the treatment of peptic ulcer, and the compositions of the invention include liquid and solid compositions based on milk and milk solids. v

According to another aspect of the invention there is provided a method of reducing gastric secretion, especially the secretion of gastric acid, which method comprises administering to a subject an anti-secretory efiective amount of a compound of formula I preferably orally.

According to another aspect of the invention there is provided a method of treating peptic ulcer which cornprises administering to a subject an anti-secretory efiective amount of a compound of formula I preferably orally.

of R are the following:

1, 1-dimethyl-4- 9-xanthenyl semicarbazide 1, 1-pentamethylene-4- 9-xanthenyl semicarbazide 2-methyl-1,1-pentamethylene-4-(9-xanthenyl) semicarb azide 1,1-tetramethylene-4-(9-xantheny1)semicarbazide 1, 1-hexamethylene-4- 9-xanthenyl) semicarbazide l, l-diethyl-4- ('9-xanthenyl semicarbazide 1,1-dimethyl-4-(9-xanthenyl) thio semicarbazide 4-hydroxy-4- (9-xanthenyl) semicarb azide 4-( 1-chloro-9-xanthenyl) -1,1-dimethylsemicarbaz.ide 1, 1-dimethyl-4-( l-methyl-9-xanthenyl semicarbazide 1, 1,4-trimethyl-4- (9-xanthenyl) semicarb azide 4-methyl-4- (9-xanthenyl) semicarb azide 4-methoxy-L (9-xanthenyl) semicarb azide 4-isopropoxy-4- (9-xanthenyl) semicarbazide 4-isopropoxy-1, 1-dimethyl-4- (9-xanthenyl) semicarb azide 4- 9-x anthenyl) semicarb azide 2-methyl- 4- (9-xanthenyl) semic arbazide 4- (9-thiaxanthenyl) semicarb azide 4-hydroxy- 1 l-dimethyl-4- (9-xanthenyl) semicarb azide 4-hydroxy-1,1-dimethyl-4-(9-thiaxantheuyl) semicarb azide 1-acetyl-4- (9-xanthenyl) semicarbazide 4-acetoxy-1, 1-dimethyl-4- (9-xanthenyl) semic arbazide 1, 1-dimethyl-4-propionyloxy-4- (9-xanthenyl) semicarb azide 4-isobutyryloxy-1,1-dimethyl-4-(9-xanthenyl) semicarb azide 4-butyry1oxy- 1, 1-dimethyl-4- (9'xanthenyl semicarbazide 4-hexanoyloxy-1, l-dimethyl-4-(9-xanthenyl) .4

semicarbazide 1-ethoxycarbonyl-4- (9-xanthenyl) semicarbazide 1,2-dimethyl-4- 9'-xanthenyl semicarb azide l-isopropyl-4- (9-xanthenyl) semic arbazide 1,1,2-trimethyl-4- (9-xanthenyl) semicarb azide N -trimethylammonio-N -9-xanthenylurea iodide 1, l-diethyl-4-hydroxy-4- 9-xanthenyl semicarbazide 0 4-hydroxy-1, 1-dipropyl-4- (9-xanthenyl) semicarbazide 4-hydroxy-1, 1-pentamethylene-4- (9-xanthenyl) semicarbazide V 4-hydroxy- 1, 1,2-trimethyl-4- (9-xanthenyl semicarb azide 4-hydroxy-1, 1-tetramethylene-4- (9-xanthenyl) semicarbazide 4-benzyloxy- 1,1-dimethyl-4- (9-xanthenyl) semicarbazide 4-hydroxy-2-methyl-4- ('9-xanthenyl) semicarbazid 4-hydroxy-1,2-dimethyl-4-(9-xanthenyl) semicarb azide 2-ethyl-4-hydroxy-4- (9-xanthenyl) semicarb azide 1,2-diethyl-4-hydroxy-4- (9-xanthenyl semicarbazide 4-hydroxy-1,1-dimethyl-2-propyl-4-(9-xanthenyl) semicarb azide V 4-hydroxy- 1,2-dipropyl-4- (9-xantheny1) semicarbazide 1, 1-dibuty1-4-hydroxy-4- 9-xanthenyl) semicarbazide 4-hydroxyl 1- 3-oxapentamethylene) -4- (9-Xanthenyl) semicarb azide 1-acety1-4-hydroxy-4- (9-x anthenyl) semic arb azide 2-fi-carboxyethyl-4-hydroxy-4- (9-Xanthenyl) semicarbazide lactam 4-hydroxy-2-methyl- 1 1-pentamethylene-4- (9-X anthenyl) semicarbazide 4-ethyl-4- (9-x anthenyl) semicarbazide 1-ethy1-4-(9-xanthenyl) semicarrbazide 1-ethyl-1-methyl-4- 9-xanthenyl) semicarbazide 4- (9-xanthenyl thiosemic arb azide 4-methyl-4- (9-xanthenyl thiosemicarb azide 4-hydroxy-4- (9-thiaxanthenyl) semicarbazide 4-acetoxy-1,1-dimethyl-4(9-thiaxanthenyl) semic arb azide 1-ethyl-4-hydroxy-4- (9-x anthenyl) semicarbazide v 4-acetoxy-1-acetyl-1-ethyl-4-(9-xanthenyl) semicarbazide 1, 1-dimethyl-4-pivaloyloxy-4- (9-xanthenyl) semicarbazide 4-p-methoxyphenylacetoxy-1, 1-dimethyl-4- 9- xanthenyl)semicarbazide 4-meth0xyacetoxy-1,1-dimethyl-4-(9-xantheny1) semic arbazide 4-ethoxalyloxy-1, 1-dimethyl-4- (9-xanthenyl) semic arb-azide 4 furoyloxy- 1, 1-dimethyl-4- ('9-xanthenyl) semic arb azide 4-crotonyloxy-1,1-dimethyl-4-(9-xanthenyl) semicarbazide 4-benzoy1oxy-1, 1-dimethy1-4- (9-xanthenyl) semicarb azide 4-p-chlorobenzoyloxy-1, 1-dimethyl-4- ('9-xantheny1) semic arbazide 4-ethoxycarbonyloxy-1,1-dimethyl-4-(9-xantheny1) semicarbazide 1, 1-dimethyl-4-phenylcarbamyloxy- 4- (9-Xanthenyl) semicarb azide 4-allyl-1, 1-dimethyl-4- 9-xanthenyl) scmic arbazide 4-cyclohexyl- 1, 1-dimethyl-4- (9-K anthenyl) semicarb azide 1, 1-dimethyl-4-trimethylsilyloxy-4- (9-xanthenyl) semicarb azide 2-allyl-4- (9-xanthenyl semicar b azide 2-allyl-4-rnethyl-4- (9-Xanthenyl) semicarbazide 2-cyclohexyl-4- 9-xanthenyl) semicarb azide 2-cyclohexyl-4-methyl-4- (9-xanthenyl) semicarb azide 2-ethoxycarbonyll, 1-dimethyl-4- (9-Xanthenyl) semicarbazide 2-ethoxycarbonyl-1 1,4-trimethyl-4-(9-xanthenyl) semicarb azide i 1 1-diallyl-4-hydroxy-4- (9-xanthenyl) semicarb azide l-cyclohexyll-methyl-4-hydroXy-4- (9-xanthenyl) semicarbazide l-ethoxy-1-ethyl-4-hydroXy-4- ('9-xanthenyl) semicarbazide l-ethyl-1-methyl-4-hydroxy-4- (9-Xanthenyl) semicarbazide 1 ,2-tetramethylene-4- 9-xanthenyl semicarbazide 4-hydroxy-1,2-tetramethylene-4 (9-xanthenyl semicarb azide N '-hydroxy-N -trimethylammonio-N -9- xanthenylurea iodide N '-acetoxy-N -trimethyl ammonia-N '-9 Xanthenylurea iodide 4-( l-chloroQ-xanthenyl -4-hydroxy- 1, 1-

dirnethylsemicarb azide 1 4-( 1-fluoro-9-Xanthenyl) -4-hydroxy- 1 1- dimethylsemicarb azide 4- (2-fluoro-9-xanthenyl) -4-hydroxy- 1,1-

dimethylsemicarbazide 4-( 1-chloro-9-Xanthenyl) semicarbazide 4-( 1-fiuoro-9-xanthenyl 'semicarbazide 4- (2-fluoro-9-xanthenyl) semicarb azide The above illustrates various values of A, B, X X and R in various combinations but of course it is to be understood that these values are not limited to the combinations named; all possible combinations are within the invention and each value of A, B, X X and R is to be considered as having been exemplified generically, independent of any particular combination of radicals.

The acyl moiety of the typical acyloxy compounds listed may of course be replaced by other acyl groups as hereinbefore defined. Examples of acyl groups are the following:

Alkanoyl, e.g. acetyl, propionyl, butyryl, valeryl, octanoyl, stearyl, pivaloyl, ethoxalyl; substituted alkanoyl, e.g. phe'nyalkanoyl such as phenylacetyl; substituted phenylalkanoyl containing substitueuts such as halogen, alkyl, alkoxy, hydroxy, amino, alkylamino, acylamino, dialkylamino or nitro in the phenyl ring; phenoxyalkanoyl such as phenoxyacetyl; substituted phenoxyalkanoyl containing substituents such as halogen, alkyl, alkoxy, hydroxy, amino, alkylamino, acylamino, dialkylamino, or nitro in the phenyl ring; haloalkanoyl such as beta-chloropropionyl; alkoxyalkanoyl such as mcthoxyacetyl; alkylthioalkanoyl such as methylthioacetyl;

dialkylaminoalkanoyl such as diethylaminoacetyl;

acyl alkanoyl such as acetoacetyl;

cycloalkyl alkanoyl such as cyclohexylacetyl;

carboxyalkanoyl such as beta-carboxypropionyl;

carboxyalkenoyl such as beta-carboxyacryloyl, and similar groups in ester or salt form; heterocyclic alkanoyl such as pyridineacetyl;

alkenoyl e.g. crotonyl;

cycloalkanoyl e.g. cyclohexylcarbonyl;

aroyl e.g. benzoyl, naphthoyl, substituted benzoyl in which the phenyl ring contains substitueuts such as halogen, alkyl, alkoxy, hydroxy, amino, alkylamino, acylamino, diakylamino, nitro or carboxyl (and esters and salts thereof);

residues of carbonic acid e.g. alkoxycarbonyl such as methoxycarbonyl, ethoxycarbonyl; substituted alkoxycarbonyl such as Z-methoxyethoxyczirbonyl, 2-phenoxyethoxycarbonyl, 2-chloroethoxycarbony1, 2,2,2-trichlo- 'roethoxycarbonyl; alkenyloxycarbonyl such as allyloxycarbonyl; cycloalkoxycarbonyl such as cyclohexyloxycarbonyl; aryloxycarbonyl such as phenoxycarbonyl and similar groups containing halogen, alkyl, alkoxy, hydroxy, amino, alkylamino, acylamino, dialkylamino or nitro substituents in the phenyl ring; aralkoxycarbonyl such as 2-phenylethoxycarbonyl;

N-substituted carbamoyl e.g. N-alkylcarbamoyl such as N methylcarbamoyl; N,N dialkylcarbamoyl such as 1 N,N-dimethylcarbamoyl; N-phenylcarbamoyl; N,N-tetramethylenecarbamoyl; N,N-pentamethylenecarbamoyl;

I N,N-3-oxapentamethylenecarbamoyl; N,N-B-thiapentamethylenecarbamoyl; v

heterocyclic carbonyl e.g. groups comprising a carbonyl radical attached to a 5-Tmembercd heterocyclic ring containing up to two hetero atoms selected from oxy- .9 gen, sulphur and nitrogemsuch as thiophen, tetrahydrothiophen, furan, tetrahydrofuran, pyridine, benzothiazole, benzofuran, xanthen," pyrimidine.

' I The following non-limitative examples illustrate the in- :vention.

' EXAMPLE 1 1,l peutaniethylene-4- (9-xanthenyl) semicarbazide, m.p. 202 202.5 C. (from chloroform/petroleum ether b.p; 40-60" C. Z-methyl- 1,1 -pentamethylenel- 9-xanthenyl) semicarbazide, m.p. '153-155 C. (from petroleum ether b.p.' 6268' C., and a trace of chloroform) 1,1-tetramethylene 4-(9-xanthenyl)semicarbazide, m.p. 203206 C. (from chloroform/ petroleum ether b.p. 40-60'C. g I 1,1-hexamethylene 4-(9-xanthenyl)semicarbazide, m.p. 201-202 C. (from chloroform/petroleum ether -b.p, 40-60 C. 1,1-dietliyl-4-(9-xanthenyl)semicarbazide, m.p. 164 168 C. (from chloroform/petroleum ether b.p. 40-60" 0. f 1,1-dimethyl-4-(9-xanthenyl)thiosemicarbazide, m.p. 215-217. C. (from acetone) 4-hydroxy-4-(9-xanthenyl)semicarbazide, m.p. 184- 185 C. (from ethyl acetate) 4- 1-ch1oro-9-xanthenyl) -1,1-dimethylsemicarbazide, m.p.

2172l9 C. (from acetone) 1,1-dimethyl 4(1-methyl-9-xantheny1)semicarbazide, m.p. 222-223 C. (from acetone) EXAMPLE 2 A solution of N-met-hyl-N-9-xanthenylcarbamoyl chloride (1.95 g.) in toluene (20 ml.) was added to micecooled solution of N,N-dimethylhydrazine (0.9 g.) in dry i f'In a similar manner using the appropriate carbarnoyl (chloride and hydrazine hydrate, the following compounds wereprepared: 4-methyl-4-(9-xanthenyl)semicarbazide, m.p. 146l48 .C. (from chloroform/petroleum ether, b.p. 6268 C.) 4-methoxy-4-(9-xanthenyl)semicarbazide, m.p. 141143 C."(from chloroform/ether) r 4-isopropoxy-4-(9-xanthenyl)sernicarbazide, m.p. 134 C. (from 'cyclohexane) 1 4-isopropoxy 1,1 dimethyl 4 "(9-xanthenyl)semicarbazide, m.p. -157.5 C. (from cyclohexane). (Pregpared using N,N-dimethylhydrazine instead of hydrazine hydrate) v N-Methyl-N-9-xanthenylcarbamoyl chloride was prepared by adding a mixture of N-methyl-9-xanthenylamine .(10 g.) triethylamine (7 m1.) and dry toluene (30 ml.) to a 10% solution of phosgene in toluene (250 ml.) at about 17 C. After overnight standing, the reaction product was evaporated at less than 30 C. under reduced pressure to dryness. The residue was boiled with petroleum ether (b.p. 62-68 C.), triethylarnine hydrochloride filtered off, and the filtrate crystallised to give N-methyl- N-9-xanthenylcarbamoyl chloride, m.p. 9495 C.

-10 N-Methoxy-N-9-xanthenylcarbamoyl chloridewas prepared by adding a mixture of N,-methoxy-N-9exa nthenylamine (7 g.), triethylamine (9 ml.) and toluene (10 ml.) to a 10% solution of phosgene in toluene (93 ml.) .at 15 C. to 10 C. The reaction mixture was stirred at 10 C. for 15 minutes and then allowed to attain room temperature over 1 hour. Evaporation in vacuo after filtering from triethylamine hydrochloride. gave crudeN- methoxy-N-9-xanthenylcarbamoyl chloride in the form-of a yellow-brown oil. This was used dissolved in toluene. N-Isopropoxy-N-9-xanthenylcarbamoyl chloride was prepared in a similar manner in the form of a brown oil, and this was used dissolved in toluene. i

' EXAMPLE 3 (a) A solution of S-phenyl N-hydroxy-N-9-xanthenylthiocarbamate (1.7 g.) in pyridine (12.5 ml.) containing triethylamine (0.4 ml.) was treated with hydrazine hydrate (0.78 ml.) at room temperature and left for4 hours. After heating on the steam bath for 1' hour and overnight standing at room temperature, the reaction mixture was diluted with water (35 ml.) and filtered. The filtrate was diluted with a large volume of water; the resulting precipitate was crystallised from dimethyljformamide/toluene to give 4-hydroxy-4-(9 xanthenyl) semicarbazide, m.p. 186 C. i

In a similar manner using S-phenyl N-9-xanthenylt'hiocarbamate in place of S phenyl N-hydroxy-N-9-xanthenylthiocarbamate, there was prepared 4-(9-xanthenyl) semicarbazide, m.p. 212-214 C. (from dimethylformamide/toluene) In a similar manner using S-phenyl N-9-xanthenylthiocarbamate and methylhydrazine, there 'was obtained 2.- methyl-4-(9-xanthenyl)semicarbazide, m.p. 183-186 C. (from benzene).

The starting thiocarbamates were prepared as follows. S-Phenylthiocarbonyl chloride (2.8 ml.) was added to a stirred solution of N-9-xanthenylhydroxylamine (2.13 g.) in pyridine (10 ml. at 0 C. After overnight standing at 0 C., the reaction mixture was diluted with water ml.). The product was isolated in ether (washing with fresh 5% aqueous sodium carbonate) and crystallised from acetone/petroleum ether b.p. 6268' C. to give S-phenyl N-hydroxy-N-9-xanthenylthiocarbamate, m.p. 177-178 C.

In a similar manner using N-9-xanthenylamine in place of N-9-xanthenylhydroxylamine, there was prepared S- phenyl N-9-xanthenylthiocarbamate, m.p. 185187 C.

(from acetone).

(b) O-Chloroformyl ethyl methyl 'ketoxitne (3.3 g.)

was added dropwise to a solution of N-9-xanthenylhydroxylamine (4.26 g.) in dry pyridine (20 ml.) at 0 C., and allowed to stand for 1 hour to give a crude solution of ethyl methyl ketoxime N-hydroxy-N-9-xanthenylcarbamate. 5 ml. of this was treated with hydrazine hydrate (1.6 ml.) and left at room temperature for 4 days. The reaction mixture was then poured into a large volume of water and the product isolated in ethyl acetate (35 ml.); this solvent was evaporated and replaced by toluene (8 ml.) and evaporation continued to a residual volume of about 5 ml. The solid which separated was recrystallised from dimethylformamide/ toluene to give 4-hydr0xy-4- I (9-xa'nthenyl)semicarbazide m.p. 184 C.

(c) Ethyl N-9-xanthenylcarbamate (1 g.) and N,N- dimethylhydrazine (5 ml.) were added to a solution of sodium (01 g.) in methanol (10 ml.). The mixture was sealed in a pressure vessel and heated at 100 C. for 18 hours, after which time it was evaporated to dryness. Recrystallisation from benzene and then carbon tetrachloride gave 1,1 dimethyl 4 (9-xanthenyl)semicarbazide, m.p. 189-191 C. p

(d) Hydrazine hydrate (0.82 ml.) was added to a solution of S-phenyl N-9-thiaxanthenylthiocarbamate (679 mg.) in pyridine (7 ml.) containing triethylamine (1.4 ml.) at 0 C. After 3 hours at 0 C., the reaction mixture 'was diluted with ice/water (50 ml.) and the resulting precipitate recrystallised from chloroform/petroleum ether b.p. 62-68 C. to give 4-(9-thiaxanthenyl)semicar- 'bazide, m.p. 199201 C. i

S-Phenyl 'N-9-thiaxanthenylthiocarbamate (m.p. 161- S-Phenylthiocarbonyl chloride (6 ml.) in dioxan (20 ml.) was added dropwise to a stirred, ice-cooled solution of N,N-dimethylhydrazine (5.04 g.) in dioxan (60 ml.).

After stirring at C. for minutes, the mixture (containing S-phenyl N',N'-dimethylthiocarbazate) was filtered into a stirred solution of N-9-xanthenylhydroxylamine (8.96 g.) in pyridine (136 ml.) containing trieth- -ylamine 6.4 ml.) at room temperature. After 24 hours, the reaction mixture was diluted with water, and the resulting precipitate recrystallised from dimethylformamide/toluene to give 4-hydroxy-1,1-dimethyl-4-(9-xanthenyl)semicarbazide, m.p. 198200 C.

In a similar manner using N-9-thiaxanthenylhydroxylamine in place of N-9-xanthenylhydroxylamine, there was prepared 4-hydroxy 1,1 dimethyl-4-(9-thiaxanthenyl) water (200 ml.) and crystallisation of the precipitate obtained from dimethylformamide/toluene gave l-acetyl- 4-(9-xanthenyl)semicarbazide, m.p. 226228 C.

EXAMPLE 6 A solution of 4-hydroxy-1,1-dimethyl-4-(9-xanthenyl) semicarbazide (897 mg.) in pyridine (10 ml.) was treated 'with acetic anhydride (612 mg.) and left at room temperature for 24 hours. Dilution with ice/water (100 ml.)

'and crystallisation of the resulting precipitate from acetone/petroleum ether b.p. -'62-68 C. gave 4-acetoxy-1,1- dimethyl-4-(9-xanthenyl)semicarbazide, m.p. 120-121 C.

In a similar manner using propionic anhydride in place of acetic anhydride there was obtained 1,1 dimethyl-4- propionyloxy 4 (9 xanthenybsemicarbazide, m.p. 123-'124 C. (from acetone/petroleum ether b.p. .40 60 C.). i

In a similar manner using isobutyric anhydride there was obtained 4 isobutyryloxy 1,1 dimethyl 4 (9-.

xanthenyl)-semicarbazide, m.p. 131-l32 C.

acetone.) 1

In a similar manner using butyric anhydride there was obtained 4 butyryloxy 1,1 dimethyl-4-(9-xanthenyl) semicarbazide, m.p. 115-117 C. (from urn ether b.p. 62-68 C.).

In a similar manner using hexanoic anhydride there was obtained 4-hexanoyloxy-1,l-dimethyl-4-(9-xanthenyl) semicarbazide.

EXAMPLE 7 A solution of 4-acetoxy-1,1-dimethyl-4-(9-xanthenyl) semicarbazide (143 mg.) in methanol (5 ml.) was treated with 1N sodium hydroxide solution (0.63 ml.) and left at room temperature for 2 hours. Acetic acid (0.05 ml.) was then added and the reaction mixture diluted with (from acetone/petrole- 12 water (5 ml.). The resulting precipitate was dried to give 4 hydroxy 1,1 dimethyl -'4-(9-xanthenyl)s'e'm1- carbazide, m.p. 196-198 C.

. In a similar manner, crude 4-acetoxy-1-acetyl-4-(9- xanthenyl) semicarbazide (prepared by the method of Ex,- ample 6 from 4-hydroxy-4-(9-xanthenyl)semicarbazide) was hydrolysed to give 1-acetyl-4-hydroxy-4(9-xanthenyl) semi'carbazide, m.p. 173-176," C. (from dimethylformamide/ toluene) r EXAMPLE 8 p p as Xanthen-9- carbony1 azide (4 g.) in benzene (50 'ml.)

was warmed to SO -60 C. until nitrogen evolution ceased.

To the filtered solution (containing 9-xantheny1"isocyanate) there was added"ethoxycarbonylhydrazine (1.67 g.) in benzene (10 ml.). After 1 hour, the reactionprodnot was filtered and the residue recrystallised from -dimethylformamide/toluene to give 1-ethoxycarbonyl-4( 9- xantheny1)semicarbazide, m.p. 18819 1 C. i

In a similar manner, using methylhydrazine and N,N'- dimethylhydrazine in place of ethoxycarbonylhydragine, there were obtained respectively 2-methyl-4-(9-xanthenyl) semicarbazide, m.p. 188-190 C. (from methanol) :and 1,2-dirnethy1-4-(9-xanthenyl)semicarbazide, m.p. 1l8 119C.

Xanthen-9-carbonyl azide used above was prepared as follows.-Xanthen-9-carbony1- chloride [6.65 g., m.p. 87- 90 C., prepared by refluxing xanthen-9-carboxylic acid (6.34 g.) with thionyl chloride (25 ml.) for 2 hours and evaporating to dryness] was dissolved in acetone (25 m1.) and stirred in an ice bath. Sodium azide (2.5 g.) in water (10 ml.) Was added slowly at 1217 C., and then water (10 ml.) was added to the mixture at 10 C. The precipitate thus obtained was filtered off, washed with cold 50% aqueous acetone (20 ml.) and dried. It was then recrystallised from ether at C. to give xanthen-9- carbonyl azide, decomposition point, 72 C. 1

EXAMPLE 9 Xanthen-9-carbonyl azide (1 g.) and N,N-dimethylhydrazine (0.4 ml.) in dry benzene (15 ml.) were warmed to 60 C., causing an effervescence which was complete in 30 minutes. After 1 hour at 25 C., the precipitate was collected to give 1,1-dimethyl-4-(9-xanthenyl)semicarbazide, m.p. 189195 C.

EXAMPLE 1o Acetone 4 (9 xanthenyl)semicarbazone (274 mg'.)

I in methanol (38 ml.), aceticacid (1 ml.) and water (1 ml.) was treated with hydrogen in the presence of platinum oxide (25 mg.). When reductionwas complete, the reaction mixture was filtered, the filtrateevapor'ated to dryness, and the residue recrystallised from benzene to give 1-isopropyl-4-(9-xanthenyl)semicarbazide, m.p.

EXAMPLE 11 4 Benzyloxy 1,1 dimethyl 4-(9-xanthenyl)semicarbazide (389 mg.) in ethanol (25 ml.) was treated with hydrogen in the presence of 10% palladium charcoal (80 mg;-). When hydrogenation was complete, the reaction mixture was filtered, the product washedfrom the cata- 1, 1-diethyl-4-hydroxy-4- (9-xanthenyl) semicarbazide m.p. 208 C. (from dimethylformamide) 4-hydroxy-1, 1-dipropy1-4- 9-xanthenyl) semicarb azide 4-hydroxy-1, 1-pentamethylene-4- (9-xanthenyl) semicarbazide, m.p. 192 C. (from dimethylformamide/ toluene/petroleum ether b.p. 60-80 C. 1: 1:1)

13- 4-hydroxy-4-(9-xanthenyl)semicarbazide f 4-hydroxy-1,1,2-trimethyl-4-(9-xantheny1)semicarbazide 4-hydroxy-1,1-tetramethylene-4-(9-xanthenyl) semicarbazide I The starting materials were prepared as follows. A mixture of O-benzyl-N 9 xanthenylhydroxylamine. (3.03 g.) and triethylamine (1 ml.) in dry toluene (30 ml.) was added dropwise to a 10% solution of phosgene in toluene (30 ml.) maintained at"20- C After minutes at this temperature and 1 hour to rise to room temperature, the reaction mixture was filtered and the filtrate evaporated in vacuo to give crude N-benzyloxy N 9 xanthenylcarbamoyl chloride in the form of a brown oil. A solution of this material (about 1 equivalentyin toluene (30 ml.) was added to 1,1-dimethylhydrazine (0.6 g.)',:triethylamine (1 g.) and toluene (301111.) at room' temperature. After overnight stirrin'g,"thereaction mixture was filtered and the filtrate evaporated todryness in vacum R'ecrystallisation of the residue from cyclohexane/petroleum ether b.p. 62-68" C. gave 4-benzyloxy -'1,1* dimethyl- 4-.(9- xanthenyl)semicarbazide;'m.p. 117- C; :1." In a similar mannerthere were'prepared: 4-ben zyloxy-1;1-diethyl-4-(9rxanthenyl)semicarbazide, (from cyclohexane') m.p. 126.512 7.5 C. {lg-benzyloxy-1,1-dipropyl-4; (9-xanthenyl )semicarbazide, t m.p. 82f' C .(from chloroform/ etr 'e um ethe CL) v 4-benzyloxy-1,l-pentamethylene-4-(9-xanthenyl) semicarbazide m.p. 143-144" C. (from chloroform/ petroleum ether b.p. 62-68" C.) f 4-benzyloxy-4-(9-xanthenyl)semicarbazide H a I I. r 4-benzyloxy-1,l,2-t1'imethyl-4-(9-xantlzrenyl) semicarbazide p 4-benzyloxy-1,1-tetramethylene-4-(9-xanthenyl) I semicarbazide' I r f a EXAMPLE 12 A solution of 1,1-dimethylsemicarbazide (1.03. g.) in.

dry dioxan ml.) was stirred at room temperature for 3 hours with sodium hydride (0.48 g, 50% oil dispersion). 9-Chloroxanthen (2.16 g.) in dioxan 15 .ml.) was added dropwise-and, Iafter overnight stirring, theinixture was poured 'into ice/water (100ml) containingsaturate'd I.

aqueous sodium bicarbonate (5 ml.).rThe-tresultingprecipitate was boiled with benzene (20 ml.), cooled'and .the separated solid extracted with hot carbontetrachloride *(15 ml.). On cooling there was obtained 1;1-dimethyl-4- (9-xanthenyl)semicarbazide,m.p. l93-'l' 4 --C. r If EXAMPLE 13 Sodium hydride (0.48 g., 50% oil dispersion) was added to a solution of 1,1.-dimethyl-4 (9-xanthenyl)-semi- 'carbazide (2.83 g.) in'tetr ahydrofuran (40 ml.). After 2'- (25 ml.) was added, the solution filtered and then evapo-' rated. The portion of the residue insoluble in hot petroleum ether b.p. 4060 C. (2X 15 ml.) was recrystallised from chloroform to give 1,1,2-trimethyl-4-(9-xanthenyl)semi- EXAMPLE 14 A suspension of N-methyl-N-nitrosdN xanthenylurea (520 mg.) and platinum oxide (110 mg.) in methanol (20 ml.) was shaken under hydrogen for,12 hours. After filtration, the reaction mixture was evaporated in vacuo to about 1.5 ml. and dilutedwith water. The'precipitate was collected and the. benzene-soluble portion crystallised from benzene and from benzene/petroleum ether b.p. 62-68 C. to give 2-methyl-4-(9-xanthenyl)semicar-J bazide, m.p. 173-176 C.

The starting material was prepared as follows. A suspension of M -.methyl N 9. r xanthenylurea (5.08 g.) in acetic racid 75 ml.) and-water (5 ml.) at C. was treated with a solution of Qsodium nitrite. 1.52 g.) i n water, .(5 ml.). After ice cooling, the precipitate Was-collected and recrystallised fron'r ethanol and from benzene/ petroleum ether b.p. 6268 C to give the required product, m.p. 151 C.

EXAMPLE .15

A mixture of 1,1 dimethyl-4-(9-xanthenyl)semicarbaaide (252mg), methyliodide. (0.1 ml.).and acetone (10 ml.) was refluxedfor 7 hours After cooling,.the precipitate was recrystallised froth nitromethane to a give {trimethylammonio-Nf-9-xanthenylurea ic rd lfde, m.p. 126. C.

A solution of. 1 ,l-dimethyl 4-(9-xanthenylidene)semicarbazide .(100 mg.) ,in diiuc hyl ormamide 7 r nl. treated iyvaa;1o% palladium/charcoal and shaken in atmosphere of hydrogen. After 1 hour, platinum oxide 20 mg.) was added and shaking continued a further hour. The mixture was filtered and the filtrate evaporated to drynessin vqcuojrheresidue was extracted-With boiling carbon; .tetrachlor ide, .filtered and the filtrateevaporated o. mel bul a ql n v d mdhy :(9:x enyn rbazid The starting material was prepared as follows. S- Phenylthiocarbonylchloride (6 ml.) in dioxan (20 ml.) was added dropwise to a stirred, ice-cooled solution of -N,N-dimethylhydrazine (5.06 g.) in dioxan ml.). After stirring at 0 C. for 15 minutes, the mixture (containing S-phenyl N ,N '-dimethylthiocarbazate) was filtered into a stirred'solution of xanthone imine (4.1 g.) in pyridine ml.) and triethylamine (3 ml.) at room temperature. After 11 days, the mixture was diluted with icewater-(150 ml.) and filtered. After further dilution (500 ml.) the mixture was extracted with ether. Evaporation of the ether solution gave a yellow gummy solid. Trituration of this with a little ether gave 1,1-dimethyl-4-(9- xanthenylidene)semicarbazide, m.p. 168-169 C. (from acetone/petroleum ether, b.p .40-60 0.). 1

.-'[Sati'sfactory elemental analyses were obtained for the compound'sprepared in the-above Examples. Structures were confirmed by infra red spectroscopy and, where necessary, by nuclear magnetic resonance spectroscopy. In many cases, the compounds'in'elted with decomposition at the temperatures described] EXAMPLE 16 In the preparation of tablets, mixtures of the following type may be tabletted in conventional manner:

- Percent by -weight Compound of formula I 10-90 musse 0-80 Maize starch 5-10 Magnesium stearate ca. 1

lt/Iicro'crystalline cellulose "0-90 EXAMPLE 17 In the preparation of tablets the following mixture was dry granulated and compressed in a tabbletting machine do give t ab'let s containing 50 mg. of active ingredient Percent by weight 4-.-1 1ydroxy-1,1. dimethyl-4-(9 xanthenyl)semicar- .bazide 25 Maize-starch 10 Lactose 20 Magnesium stearate 1 Microcrystalline cellulose to capsules, each capsule containing 50 mg.

EXAMPLEi in the preparation of tablets the following mixture was I dry granulated and compressed in a 'tabletting "rnachin'e tc'e to give tablets containing 50mg. of active ingredientf 4 by" droxy 1il-dimethyll (9-xanthenyl) semicarbazide 10 g, lactose-(l0 g'.), and maize starch"(5 g.)'.

- EXAMPLE 211 '1 In the preparation of capsules, a mixture of *tlie'ingredien'ts described in Example 19 was encapsulated in hardgelatin capsules. Enteric coating was'a'pplied'by conventional dipping in cellulose acetate 'phthalate; 7

EXAMlPLE 22 The following mixture was compressed into'tablets in a conventional manner:

' 1 Percent 4-hydroxy-l,1-dimethyl 4 (9 xanthenyl)semicarbazide 25 Sodium bicarbonate '75 Peppermint oil gs EXAMPLE 23 In the preparation of capsules a mixture of equal parts by weight of 4-hydroxy-1,l-dimethyl-4-(9-xanthenyl)semicarbazide and lactose was encapsulated in hard gelatin of the semicarbazide. I

EXAMPLE 24 In the preparation of enteric coated capsules the capsules of Example 23 were coated with cellulose acetate phthalate in the conventional manner.

EXAMPLE 25 4-hydroxy 1,1 dimethyl-4-(9-xanthenyl)semicarbazide were prepared in conventional manner using a basecon- EXAMPLE 26.v

A solution for parenteral administration prepared 2 comprising 4-hydroxy-1,1-dimethy1-4-(9-Xanthenyl) semicarbazide in propylene glycol, 100 mg./ 2 m1. sterilised by filtration.

Compositions similar to those described in Examples 16-26 were also prepared, containing other compounds of formula I previously described in place of 4-hydroxy-1,i-

dimethyl-4- (9-xanthenyl) semicarbazide.

We claim; a s

55 Suppositories weighing 1 g; and containing 50 mg. i

:16 1. A therapeutic/composition which comprises an antisecretory elfliect i ve. amount of, an active ingredient selected from the group consisting of i (a) a compoundof liormulal v,

| 1] y Xn--N -N NR;;R wherein-Xn 'represents the group in which theringsyA-and Bmoptionally contain substit- 5 j'sllents selected from the-group consisting of halogen,

:slower-alkyl, lower alkoxy and hydroxy; i -R is a hydrogen lower alkyl of lower alkenyl;

. R ishydro gen or lower alkyl; W

" #R is hydrogen or lower alkyl;

- R4 is hydrogen or lower alkyl; r

(b) a pharmaceutically acceptable acid a compound of Formula I; and (c). when R and R -are each loweralkyl, a pharmaceuticallyacceptable quaternary salt of a compound of liormula I; i I j and a "phar-maceuticallyfa ceptable excipient, said composition' being suitable 'for oral, rectal or parenteral administration.

2. The composition of vclaim 1 which comprises 0.1-

% by weight of active ingredient.

3. The composition of claim 1 suitable for oral administration and in the form of a tablet or capsule.

4. The composition of claim 3 wherein said tablet or capsule is enteric coated.

5. The composition of claim 3 wherein said tablet or capsule contains 25-500 .mg. of active ingredient.

6. The composition of claim 1 suitable for rectal administration and'in the form of a suppository.

' '7: The composition of claim 1 wherein said active ingredient is4-(9-xanthenyl)semicarbazide having a melting point of about 2l22l4 C.

8, The composition of claim 1 wherein said active ingredient is. 1,1 dimethyl-4-(9-xanthenyl)semicarbazide.

9. A method of reducing gastric secretion in a patient suffering from an excess of gastric secretion which comprisesthe administration to said patient of an anti-secretoryelfective amount of a xanthen compound selected from the group consisting of (a) a compound of Formula I addition salt of in which the rings A and B optionally contain substituents selected from the group consisting of halogen, lower alkyl, lower. alkoxy and hydroxy; R is hydrogen, lower alkyl or lower alkenyl; R is hydrogen'or lower alkyl; "R is hydrogen or lower alkyl;

R; is hydrogen or lower alkyl; I -(b) aa'pharmaceutically acceptable-acid addition salt I ofazcompound of Formula I; and

(0) when R and -R are each lower alkyl, a pharmaceuti'cally acceptable quaternary salt of a compound of Formula I. 7 v

17 18 10. The method of claim 9 wherein said xanthen eom- References Cited POLlIld iS 1,1-dimethyl-4-(9-xanthenyl)semicarbazide. UNITED STATES PATENTS 11. The method of claim 9 wherein said compound is 3,502,662 3/1970 Childress et all n 2609335 administered orally. is 1311113352??? 55102 5221; 33353 23$??? 5 ALBERT MEYERS Primary Examine y F. E. WADDELL, Assistant Examiner 13. The method of claim 9 wherein said compound is Us CL XR 4-(9-Xanthenyl)semicarbazide having a melting point of about 212 214 C 10 424-251, 263, 270, 275 

1. A THERAPEUTIC COMPOSITION WHICH COMPRISES AN ANTISECRETORY EFFECTIVE AMOUNT OF AN ACTIVE INGREDIENT SELECTED FROM THE GROUP CONSISTING OF (A) A COMPOUND OF FORMULA I 